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Then, according to Brewer's letter, the officer "grabbed" and "pushed" an African-American woman in her entourage.

"None of this was called for," she wrote.

The letter continues: "Finally, after an hour and a half, an NYPD officer of a higher rank came by and had me released. However, this was only after Council staff spoke by cell phone to parade organizers, who had to communicate my situation to this NYPD individual."

Brewer said she did not tell anyone about the incident, or write the letter, until after she heard about the detainment of Williams.

"In my own case I refrained from making a public matter of the way in which I was treated, but after the incident with Council Member Williams, perhaps I should have spoken up earlier," she wrote.